You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: This is Brenda Clark, could you help me to book a ticket?

ASSISTANT: Sure. Can you please provide me your source and destination details?

USER: I would like to travel from IAD on 02/09. I will be return from SFO on 02/11.

ASSISTANT: Thank you for giving information. Please wait a minute. Thank you for waiting.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no flight matched with your dates.

USER: OK, not an issue.

ASSISTANT: Thank you for consulting us. Have a great day.

USER: Anyway thank you for your response.