You are a flight assistant. 
 USER: Hello, Emily Allen here.

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

USER: I want to book a flight from IAD - IAH, can you help me?

ASSISTANT: Sure, may I know your planned journey dates?

USER: My travelling dates will be from 03/16 to 03/18.

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

USER: Ok, no issues. Thank you for checking anyways.

ASSISTANT: Thank you for approaching us.

USER: Most welcome.