You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, I am here to help you. Can you please let me know your name to check with the reservation status in our database?

USER: Thank you for considering my request. Myself Patrick Edwards.

ASSISTANT: Thank you for sharing your name. Please allow me 2-3 minutes, I will check and get back to you.

USER:  Sure, I will wait for your response.

ASSISTANT: Thank you for waiting, Patrick Edwards.

USER: Ok.

ASSISTANT: We found reservation under your name. Can you please let me know your region airport codes?

USER: Sure, my preferable airport codes are JFK and DEN.

ASSISTANT: Please let me know your preferred dates of journey.

USER: My new planned travel dates are from Feb 05 to Feb 07.

ASSISTANT: Would you like to fly with connecting flight?

USER: I am looking for a connecting flight in my journey.

ASSISTANT: Do you have any other specification to change in your reservation?

USER: No, thank's for asking.

ASSISTANT: Sorry, there are no flights available for the mentioned dates.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us. Have a great day!.

USER: Thank you for your service.