You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Kimberly Robinson.

ASSISTANT: How can I assist you today?

USER: Can you book a ticket from SFO to IAD, to meet my family friend.

ASSISTANT: Sure, please mention your travelling dates.

USER: Sure, my travelling dates are 04/09 and 04/11.

ASSISTANT: Please give me a moment.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, there is no flights available under your preferable details.

USER: It's ok, thanks for checking.

ASSISTANT: Welcome, have a great day.