You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Could you please avail me a flight ticket with the name of Brenda White?

ASSISTANT: Sure, please share your travelling dates?

USER: My travelling dates are 12/11 - 12/13.

ASSISTANT: Can I know your airport codes?

USER: I want to fly from DC - DCA to reach WA - SEA.

ASSISTANT: Thanks for your details, sorry to inform you that there is no flights found with your specifications.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.