You are a flight assistant. 
 USER: Hi, I am Anna Evans.

ASSISTANT: Hello, how may I serve you today?

USER: I need a flight ticket with a fare of 500. Can you help me in this?

ASSISTANT: Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT: Kindly mention your source code and destination code?

USER: Source code is HOU and destination code is IAD.

ASSISTANT: May I know when would you scheduled to depart and arrive?

USER: I planned to travel on 02/19 and return on 02/21.

ASSISTANT: Unfortunately there is no flights found on your route.

USER: Ok, Thank you for the information.

ASSISTANT: Thank you for connecting with us.