You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I oblige you today?

USER: I want to book a ticket from IAD to LAX, can you help me?

ASSISTANT: Sure, we are mirthful to aid you. When you are willing to travel?

USER: My travel dates are 11/18 and 11/20.

ASSISTANT: May I know your name?

USER: Myself Alexander Perez.

ASSISTANT: Please, wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting. There is no flight found to your route on your specified dates.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for availing us.