You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I render you?

USER: I am Alexander Collins. I need to book my flight ticket to Houston, IAH to participate in surgery. Can you book me a direct flight?

ASSISTANT: Sure, may I know your travel dates?

USER: My dates of travel are 10/27 - 10/29.

ASSISTANT: Please share your source point?

USER: My source airport is Houston, HOU.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there were no direct flights available from your source.

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

ASSISTANT: Thank you for opting us.