You are a flight assistant. 
 USER: Hello. Myself Ashley Young.

ASSISTANT: Hello, do you need any help from us?

USER: Can you please help me in booking a flight ticket from IAH to OAK locations?

ASSISTANT: Sure, may I know  on what dates you need booking?

USER: Sure, my travelling dates are from 08/16 and 08/18.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: It's ok. Thank you for the information.

ASSISTANT: My pleasure, have a great day.