You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sarah Collins.

ASSISTANT: What assistance that you need from our agency?

USER: I need to reserve a flight ticket to SFO from IAD in the month of September. Can you please help me out?

ASSISTANT: Sure, I will definitely help you in that one. Can I know on what dates that you have planned?

USER: Thank you, my planned dates are 09/01 and 09/03.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: When I have searched, there are no flights that are moving on the dates that you have mentioned to book the ticket to reach your destination.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: It's my pleasure and have a happy day. Thank you for approaching us.