You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Samuel Smith here.

ASSISTANT: Smith, how may I aid you today?

USER: Reserve a flight ticket for me from IAH to DEN.

ASSISTANT: Ok, can you please share your travelling dates?

USER: My preferable dates for travel will be from 06/11 to 06/3. Sorry it is from 06/11 to 06/13.

ASSISTANT: Sorry for the inconvenience Smith, no flights as per your details.

USER: Ok, not a problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.