You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Due to my health conditions, I want to change my recent reservation.Can you help me with that?

ASSISTANT: Sure, I am here to help you for this. Let me check your reservation status in our database.

USER: Ok.

ASSISTANT: For changing the reservation, may I know your name please?

USER: Jeffrey Collins here.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry for inconvenience, no reservation is found with your criteria.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you very much for connecting with us.