You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you for the day?

USER: I want to to do some changes in my existing reservation due to an emergency. Can you aid me in amending my past reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know on which name the ticket was reserved?

USER: I am Frank Thompson.

ASSISTANT: Please be on hold.

USER: Take your time.

ASSISTANT: Sorry we did not find any reservation against your name.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for choosing our services.

USER: You are welcome.