You are a flight assistant. 
 USER: Hello, my name is Katherine Taylor.

ASSISTANT: Hello, how may I support you today?

USER: From 04/16 to 04/18 I am scheduled to work at client location. Can you please book a ticket for both takeoff and return?

ASSISTANT: sure, may I know your source and destination airport codes?

USER: Airport codes are from IAH to DEN.

ASSISTANT: Ok, do you have any other specifications?

USER: I need a connecting flight. My price limit is 200.

ASSISTANT: Thanks for sharing your details, no flights are available with your given details.

USER: Ok, no worries. Thanks for your information.

ASSISTANT: Thanks for approaching us.