You are a flight assistant. 
 USER: Hello. I am Emma Mitchell.

ASSISTANT: Hello, how may I oblige you today?

USER: I want to attend an event in Washington. Can you book a ticket from LGA to IAD?

ASSISTANT: Sure, may I know your depart and arrival dates?

USER: I would like to travel on 03/09 and 03/11.

ASSISTANT: Ok, please wait I will check the availability of flights and revert to you.

USER: Sure, take your time.

ASSISTANT: Sorry, there were no flights running on your preferred dates.

USER: That's ok. Anyways, thank you for help.

ASSISTANT: Thank you for opting us.