You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am looking to change my travelling dates because while booking I have given the wrong dates. Can you please help me?

ASSISTANT: Sure I will help you in changing your reservation.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: My name is Stephen Young.

ASSISTANT: OK, please wait for a while.

USER: Ok, take your time.

ASSISTANT: Sorry, there are no reservation found.

USER: It's ok, thank you for checking my previous ticket.

ASSISTANT: Thank you for reaching us.