You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hi. How can I help you?

USER: I am Gary Lopez. I want to fly from LAX to DCA. Can you please book a flight ticket for me?

ASSISTANT: sure, may I know your date of journey?

USER: My journey dates are from 02/15 to 02/17.

ASSISTANT: I am sorry Gary Lopez, I cannot find any flight on your request.

USER: Ok, no issues.

ASSISTANT: Thank you.

USER: Thank you for your information.