You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I benefit you?

USER: Can you please hold me a flight ticket with the name of Linda Campbell?

ASSISTANT: Sure, may I know when do you want to travel?

USER: My travel dates are 10/10 - 10/12.

ASSISTANT: Kindly mention your airport codes.

USER: I want to fly from Washington, DC - DCA to reach Las Vegas, NV - LAS.

ASSISTANT: Ok, let me find a best flight for you.

USER: Sure.

ASSISTANT: Thanks for waiting, Unfortunately there are no flights available at this moment.

USER: Not an issue, thank you.

ASSISTANT: Thank you for reaching us.