You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My father got promotion with in two months of time in BMW company and now he became senior manager , so they are giving party to all the employees, my father want to take me with him, so can you book a flight ticket for me to SFO from my region IAH?

ASSISTANT: Sure, I can help you.

USER: Thank you. My dates are on 06/20 and back on 06/22.

ASSISTANT: Ok, thank you for providing the details.

USER: It's alright.

ASSISTANT: Sorry to inform you, there are no available flights on the dates you have given.

USER: Ok, sad to hear that I cannot reach my destination on those days because of no flight, I will plan some other dates. Thank you for your help.

ASSISTANT: It's my pleasure. Thank you for reaching us. Have a nice day. May I know your good name for reference?

USER: Sure, I can provide you. My name is William Baker.

ASSISTANT: Ok, thank you.

USER: Welcome.