You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Thomas Hill here.

ASSISTANT: In which way I can assist you today?

USER: I was looking for a flight from the route IAD - LAX to meet my aunt as she is hospitalised, can you help me?

ASSISTANT: Sure, I can assist you with that. Can you please let me know your travel dates for booking flight ticket?

USER: I was planning to takeoff on 02/17, and I will be returning on 02/19.

ASSISTANT: Ok, please wait a moment, I will check flight availability.

USER: Sure, take your time and let me know the availability status.

ASSISTANT: Sure. Sorry, there are no flights available in this route as per your requested dates.

USER: Ok, no issues. Anyways, thank you for assisting me.

ASSISTANT: Thank you for reaching us, have a good day.

USER: You are most welcome.