You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need your support to change my recent booking.

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

USER: Thank you.

ASSISTANT: For changing the reservation. May I know your name please?

USER: My name is Rebecca Williams.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait.

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

USER: That's ok. Thank you.

ASSISTANT: Thank you very much for contacting our agency.