You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I render you today?

USER: I need to book a direct flight to Las Vegas, LAS for an attending a surgery. Can you help me in booking me a plane from Houston, IAH?

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

USER: Thank you.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: 01/19 - 01/21 are my dates for trip.

ASSISTANT: On what name, do I need to reserve the ticket?

USER: You can reserve flight ticket on my name Rachel Campbell.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Sure.

ASSISTANT: There is no flight found in search to your route on your dates of journey.

USER: Ok, I will choose other airline. Thank you for your help.

ASSISTANT: Thank you for reaching us.