You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Katherine Taylor, can you help me to book a flight from IAD to SFO?

ASSISTANT: Ok, can I have your travelling dates to get a flight for you?

USER: My travelling dates are 07/13 and 07/15.

ASSISTANT: Wait a moment please.

USER: Sure, take your own time.

ASSISTANT: Sorry to inform you, there is no flight found on your route to book a ticket for you.

USER: It's ok, thanks for your information.

ASSISTANT: Thanks for reaching us, have a good day.