You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Nicole Thomas here.

ASSISTANT: What help that I can do for you now?

USER: I would like to book a ticket from IAD to PHL, can you please help me with that?

ASSISTANT: Sure, I will help you in that one. Can you please provide your trip dates?

USER: The travel dates are from 08/15 to 08/17.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: I am unable to find a flight on your travelling dates to book the flight ticket.

USER: That's ok, thank you for your help.

ASSISTANT: It's my pleasure and thank you for approaching us.