You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Christine Clark here.

ASSISTANT: How can I help you today?

USER: My client meeting has been postponed, so I want to reschedule my itinerary dates.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no active reservation on your given name.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.