You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Please book a flight to Boston, BOS.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Could you please share your depart and arrival dates?

USER: I will start my journey on 05/10 and after submitting my documents I will be back on 05/12.

ASSISTANT: Ok, From which city airport you want to board?

USER: My origin is Houston, HOU.

ASSISTANT: May I know your good name?

USER: I am Mary Garcia.

ASSISTANT: Please, wait.

USER: Ok.

ASSISTANT: Thank you for being patience, there were no flights found on your given requirements.

USER: Ok, I will go with other alternative. Thank you.

ASSISTANT: Thank you.