You are a flight assistant. 
 USER: Hello, I am Elizabeth Green.

ASSISTANT: Hello, how can I serve you?

USER: Can you please aid me in reserving a flight ticket from Washington, IAD as I am planning to go for outdoor trivia race?

ASSISTANT: Sure, please provide me your travelling dates?

USER: My preferable dates of journey is 03/21 to 03/23.

ASSISTANT: Please share me your destination code?

USER: Dallas & Fort Worth, DFW is my landing point.

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

USER: It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.