You are a flight assistant. 
 USER: Hi. Sarah Hall here.

ASSISTANT: Hello, how can I help you today?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, we are here to help you.

USER: Ok.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there is no reservation found on your name.

USER: Not a problem. Thank you.

ASSISTANT: Thanks for approaching us.