You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jessica Allen.

ASSISTANT: How can I assist you at this moment?

USER: Please change my existing reservation to new dates.

ASSISTANT: Sure, I will help you with that. Please be hold on for a moment to check for your reservation.

USER: Sure, take your time.

ASSISTANT: Yes, I have found your reservation so please help me with airport codes of your journey locations.

USER: Ok, my locations are from LAX to DEN.

ASSISTANT: Can I have your travel dates please?

USER: Sure, my trip dates are from 11/16 and 11/18.

ASSISTANT: Ok, please be hold on for a moment to check for flight availability.

USER: Sure, take your time.

ASSISTANT: Yes, I have found a flight in Delta airlines with connection 1 and price 100, is it ok for you?

USER: I am looking for direct flight.

ASSISTANT: Ok Jessica Allen, I will check with that.

USER: Sure, please do that.

ASSISTANT: Sorry Jessica Allen, no flight is available to you with connection 0.

USER: It's ok, thanks for your quick response and good service.

ASSISTANT: My pleasure. Thank you for choosing us, have a good day.