Multiple Thread test completes

Signed-off-by: jsxhhyf <jsxhhyf@gmail.com>
implement the validation of email, phone number and credit number

Signed-off-by: jsxhhyf <jsxhhyf@gmail.com>
add a query method (query by flight number and seat class)

Signed-off-by: jsxhhyf <jsxhhyf@gmail.com>
query and book round trip instead of one-way trip

Signed-off-by: jsxhhyf <jsxhhyf@gmail.com>