You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you now?

USER: Due to some health issues, I want to re-schedule my dates. Can you help me in changing my existing reservation?

ASSISTANT: Ok, may I know your name to check with status and availability?

USER: I did the reservation under the name of Laura Jackson.

ASSISTANT: Can you please allow me to check with availability of your booking?

USER: Sure, take your time.

ASSISTANT: Sorry to tell you, there is no active reservation by your name.

USER: Oh! sad to hear that anyways thank you for your information.

ASSISTANT: Thank you for choosing our services regarding your requirement. Have a nice day.