You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name please?

USER: Myself Ashley Lewis.

ASSISTANT: Nice to meet you, Ashley. How can I help you?

USER: I want to change in the dates of reservation, as some of my friends are need to join us if I change the dates, can you please help me in altering my reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thanks.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry Ashley, there is no reservation found on your name.

USER: It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us, have a nice day. You are welcome.