You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Samantha Walker here.

ASSISTANT: How can I assist you today?

USER: Can you please help me in changing my recent reservation? As my planned trip has been changed to some other dates.

ASSISTANT: Sure, will you please give me a moment?

USER: Sure, take your own time.

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

USER: Oh! May be I have done a wrong booking. Thank you anyways.

ASSISTANT: Welcome, have a great day.