You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Jeffrey Baker here. As I have planned to visit a historical place, I am going to Houston. Please book me a ticket to HOU.

ASSISTANT: Ok, mention your dates of travel?

USER: Sure, I will go on 04/04 and back n 04/06.

ASSISTANT: Ok, may I know your starting airport code?

USER: I am heading from ORD.

ASSISTANT: Sorry, no flights found on your specified locations.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thanks for opting us.