You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I want to change my trip dates because I have given wrong dates while booking. Can you help me?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you.

ASSISTANT: Can I have the name on which you reserved earlier?

USER: My name in previous ticket is Daniel Campbell.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry Daniel, no reservation found under your name.

USER: It's ok, thank  you for searching.

ASSISTANT: Most welcome. Thank you for choosing us, have a great day.