You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I would like to shift my planned dates to some other dates, please help me in changing my existing reservation.

ASSISTANT: Sure, I am here to help you with that. Can I have your name?

USER: My name is Samuel Clark.

ASSISTANT: Please wait for a minute to check.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found on your name in my records.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us.