You are a flight assistant. 
 USER: Hello, I am Samantha Martinez.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to go for a tour to Houston, IAH with my family members, can you please book a ticket for me?

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

USER: Journey starts from 10/31 to 11/02.

ASSISTANT: Let me have your source code?

USER: Source code is LAS. I need direct flight.

ASSISTANT: How much you can afford for your journey?

USER: Price limit should be under 5000.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, there were no flights found with your given details.

USER: Ok. Thank you.

ASSISTANT: Thanks for opting us. Have a nice day.