You are a flight assistant. 
 USER: Hi.

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

USER: Can you help me in booking a flight from IAD to PHL?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: I like to travel on Mar 05 to 07.

ASSISTANT: Ok, could I have your name please?

USER: I am Carol Philips.

ASSISTANT: Ok, please allow me a moment.

USER: Ok.

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

USER: That's ok, thank you.

ASSISTANT: You are welcome, have a great day.