You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation which is done recently due to some health issues, can you please help me in this?

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: Thank you. Sure, my name is Richard Thomas.

ASSISTANT: I found your reservation o your given name, let me know your new travel dates?

USER: Sure, my planned dates of journey are from Jan, 24 to Jan, 26.

ASSISTANT: Could you please share me your new airport codes?

USER: Ok, my respective airport codes are from MCO to JFK.

ASSISTANT: May I know your connection limit?

USER: Yes, I want to fly in a connecting flight.

ASSISTANT: Do you need any other preference?

USER: Yes, I want to depart at afternoon time.

ASSISTANT: Sorry to inform you there are no flight available on your given details.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for contacting us.