You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Anna Carter.

ASSISTANT: Anna, how may I aid you?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Ok.

ASSISTANT: Sorry, no reservation is available by your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.