You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Virginia Harris, in this vacation I would like to visit Houston, so can you help me booking flight on 05/19?

ASSISTANT: Sure, may I know your airport codes?

USER: My airport codes are JFK to IAH.

ASSISTANT: Ok, please tell me your return journey date.

USER: I am going to return on 05/21.

ASSISTANT: Harris, there is no plane with your information.

USER: Oh! That's really sad to hear, anyway thank you for your services.

ASSISTANT: Thank you for choosing us.